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Colts quarterback Andrew Luck won’t be the only former player reconnecting with Jim Harbaugh this week.

The 49ers have signed fullback Owen Marecic to fill the roster spot of nose tackle Ian Williams, who sustained a broken ankle in Sunday’s 29-3 loss to the Seahawks and was placed on the season-ending injured reserve list.

Marecic, 24, who played for Harbaugh at Stanford, was released by the Browns on Aug. 27 and had a tryout with the 49ers a few days later. Marecic was among Cleveland’s first wave of roster cuts after a forgettable 2012 season.

He was inactive for six of the season’s final nine games and played just one offensive snap over that span, according to Pro Football Focus. In 2012, he had four dropped passes, no receptions, two special-teams tackles and played 114 offensive snaps.

A fourth-round pick in 2011, Marecic has five catches for 31 yards and four carries for eight yards in his six-start career.

Marecic, who also plays special teams, will back up fullback Bruce Miller, who has started 35 of the past 36 games, including playoff contests, dating back to his rookie season in 2011.

The signing reunites Harbaugh with one of his favorite players at Stanford.

During Marecic’s college career, Harbaugh termed the two-way standout the “perfect football player.” At the time, Harbaugh’s wife, Sarah, said her husband looked at looked at Marecic “like somebody else would look at a beautiful woman.” In 2011, Harbaugh made it clear he wanted to draft Marecic, who went to Cleveland in the fourth round.

Still, Marecic’s signing is a bit surprising given the 49ers lack of depth at defensive line.

At the moment, Glenn Dorsey is the only nose tackle on the roster and 49ers only have three other fully healthy defensive linemen: Justin Smith, Demarcus Dobbs and Tony Jerod-Eddie, who was inactive Sunday.

Defensive tackle Ray McDonald did not finish Sunday’s game because of an ankle injury. On KNBR this morning, defensive coordinator Vic Fangio was optimistic McDonald would start Sunday against Indianapolis, but didn’t expect to know with certainty until late in the week.

“I think he’s going to be OK, but … it’s a pretty fluid situation,” Fangio said. “His ankle is bothering him a little bit and we’ll see how it goes.”

The 49ers could still make another roster move to address their defensive line. They drafted two defensive linemen in Tank Carradine and Quinton Dial, who could play nose tackle, but the rookies are on the reserve non-football injury list. They are not eligible to play until Week 7, at the earliest.